package com.umeox.moto.common.encrypt;

import java.nio.charset.StandardCharsets;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;


/**
 * AES 是一种可逆加密算法，对用户的敏感信息加密处理 对原始数据进行AES加密后，在进行Base64编码转化；
 */
public class AESOperator {
	/*
	 * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式，key需要为16位。
	 */
	public static final String KEY = "2A84R23ATA7802BE";
	private String ivParameter = "4321201505041234";
	private static AESOperator instance = null;

	private AESOperator() {

	}

	public static AESOperator getInstance() {
		if (instance == null) {
			instance = new AESOperator();
		}
		
		return instance;
	}

	// 加密
	public String encrypt(String sSrc, String sKey) throws Exception {
		if (sKey == null) {
			sKey = KEY;
		}
		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		byte[] raw = sKey.getBytes();
		SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
		IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
		cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
		byte[] encrypted = cipher.doFinal(sSrc.getBytes(StandardCharsets.UTF_8));
		return new BASE64Encoder().encode(encrypted);// 此处使用BASE64做转码。
	}

	// 解密
	public String decrypt(String sSrc, String sKey) throws Exception {
		try {
			if (sKey == null) {
				sKey = KEY;
			}
			byte[] raw = sKey.getBytes(StandardCharsets.US_ASCII);
			SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
			IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
			cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
			byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密
			byte[] original = cipher.doFinal(encrypted1);
			return new String(original, StandardCharsets.UTF_8);
		} catch (Exception ex) {
			return null;
		}
	}

}